It appears that Joe Watson is missing from the 1970s Philadelphia Flyers rosters (I haven't gone earlier than 1970 yet). Only his younger brother, Jimmy Watson is shown.
In the 1973 roster, rookie Jimmy is shown as alternate captain; Joe in fact wore the "A".
Joe Watson's stats:
Joe Watson Philadelphia Flyers - 2013-2014 Stats - Philadelphia Flyers - Team
Thank you.